"Castle Shade" by Laurie R. King

Well, what do you know?  I greatly liked two of Laurie R. King's Mary Russell/Sherlock Holmes books in a row!  I very much enjoyed Riviera Gold  last year, and I also had a jolly time reading Castle Shade!  That makes me quite happy :-)
Castle Shade picks right up where Riviera Gold left off, with Russell and Holmes on a train heading to Transylvania.  Someone is creating creepy and weird problems for Queen Marie of Roumania, the kinds of problems that make you think of vampires and witches and an...